脆性玻璃形成体中Stokes-Einstein定律破坏的快动力学透视
Fast dynamics perspective on the breakdown of the Stokes-Einstein law in fragile glassformers
摘要：
通过原子液体和聚合物的分子动力学模拟以及考虑关于原型OTP玻璃形成体的实验数据，研究了在脆性玻璃形成体中斯托克斯-爱因斯坦（SE）定律的崩溃。所有四个系统都符合粘度（或结构弛豫）和Debye-Waller因子$\langle u^2\rangle$（由周围邻居形成的笼中颗粒振动的均方振幅）之间的通用标度。发现SE击穿在主曲线中由减小的$\langle u^2\rangle$缩放。推导了无可调参数和有一个可调参数的两种近似表达式。
英文摘要：
The breakdown of the Stokes-Einstein (SE) law in fragile glassformers is examined by Molecular-Dynamics simulations of atomic liquids and polymers and consideration of the experimental data concerning the archetypical OTP glassformer. All the four systems comply with the universal scaling between the viscosity (or the structural relaxation) and the Debye-Waller factor $\langle u^2\rangle$, the mean square amplitude of the particle rattling in the cage formed by the surrounding neighbors. It is found that the SE breakdown is scaled in a master curve by a reduced $\langle u^2\rangle$. Two approximated expressions of the latter, with no and one adjustable parameters respectively, are derived.
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